#1.两点距离(1.4142135623730951) select st_distance(point(0,0),point(1,1)); select st_distance(point (120.10591, 30.30163),point(120.13026,30.25961));mysql 5.6 添加 #2.两点球面距离(157249.0357231545m) select st_distance_sphere(point(0,0),point(1,1)); select st_distance_sphere(point (120.10591, 30.30163),point(120.13026,30.25961));This function was added in MySQL 5.7.6.
第一个函数是计算平面坐标系下,两点的距离,就是
如果用于计算地球两点的距离,带入的参数是角度(0-360度),则计算的单位也是相差的角度,用此角度计算距离不准。纬度距离约111km每度,经度距离在赤道平面上是111km每度,随纬度的升高逐渐降低为0。
第二个函数是计算球面距离的公式,传入的参数是经纬度(经度-180~180,纬度-90~90),返回的值以m为单位的距离。
ST_Distance_Sphere(
g1
, g2
[, radius
])
Returns the mimimum spherical distance between two points and/or multipoints on a sphere, in meters, or NULL
if any geometry argument is NULL
or empty.
Calculations use a spherical earth and a configurable radius. The optional radius
argument should be given in meters. If omitted, the default radius is 6,370,986 meters. An ER_WRONG_ARGUMENTS
error occurs if the radius
argument is present but not positive.
The geometry arguments should consist of points that specify (longitude, latitude) coordinate values:
- Longitude and latitude are the first and second coordinates of the point, respectively.
- Both coordinates are in degrees.
- Longitude values must be in the range (-180, 180]. Positive values are east of the prime meridian.
- Latitude values must be in the range [-90, 90]. Positive values are north of the equator.
Supported argument combinations are (Point
, Point
), (Point
, MultiPoint
), and (MultiPoint
, Point
). An ER_GIS_UNSUPPORTED_ARGUMENT
error occurs for other combinations.
If any geometry argument is not a syntactically well-formed geometry byte string, an ER_GIS_INVALID_DATA
error occurs.
mysql> SET @pt1 = ST_GeomFromText(‘POINT(0 0)‘);
mysql> SET @pt2 = ST_GeomFromText(‘POINT(180 0)‘);
mysql> SELECT ST_Distance_Sphere(@pt1, @pt2);
+--------------------------------+
| ST_Distance_Sphere(@pt1, @pt2) |
+--------------------------------+
| 20015042.813723423 |
+--------------------------------+
This function was added in MySQL 5.7.6.
原文地址:https://www.cnblogs.com/hdwang/p/9994153.html